有关系R(学号,姓名,系名称,系地址)描述学生情况,假设学生可以重名,学号是唯一的,每一个学生属于一个系,每一个系有一个地址,则R最高属于
A.INF
B.2NF
C.3NF
D.4NF
正确答案是B
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